Process for printing textile fabrics
View Patent ↗A printing paste containing: a) 5 to 30% by weight of a polyurethane, b) 1 to 20% by weight of an organic fixing agent, c) 0 to 50% by weight of one or more further ingredient(s) and d) water as the remainder, the sum of the amounts of components (a)+(b)+(c)+(d) being 100%, is suitable for printing textile materials.
1. A printing paste containing:
a) 5 to 30% by weight of a polyurethane,
b) 1 to 20% by weight of an organic fixing agent which is a fatty acid ester, a low molecular weight polyester or a compound obtained by the following process steps:
A) reacting a diisocyanate or a mixture of diisocyanates (component I) with one or more alcohols having from 2 to 8 carbon atoms and/or with one or more mono- and/or diethers of such alcohols (component II), these alcohols or ethers thereof having at least two alcoholic hydroxyl groups and no more than two C—O—C bonds, and the reaction being carried out such that the product formed still has free isocyanate groups,
B) reacting the product obtained in step A) with an organic amine containing two or more alcoholic hydroxyl groups, or a mixture of such amines, the reaction being carried out such that the product formed still has free isocyanate groups, with the proviso that at least one alcohol, one ether or one amine from amongst the alcohols, ethers and amines used in step A) and/or B) contains three or more alcoholic hydroxyl groups,
C) blocking the free isocyanate groups of the product obtained in step B) by reaction with a blocking agent,
D) dispersing the product obtained after step C) in water using one or more dispersants and adjusting the pH,
c) 0 to 50% by weight of one or more further ingredient(s) and
d) water as the remainder,
the sum of the amounts of components (a)+(b)+(c)+(d) being 100%.
2. A printing paste according to claim 1 containing:
10 to 25% by weight of a polyurethane,
2 to 15% by weight of an organic fixing agent,
1 to 40% by weight of one or more further ingredient(s) and
water as the remainder.
3. A printing paste according to claim 1 , wherein the urethane is used as a stable aqueous polyurethane dispersion containing less than 3% or no organic solvent.
4. A printing paste according claim 1 , wherein the polyurethane used is the polyaddition product of a diisocyanate and a polyester polyol produced by reacting a difunctional acid with an excess of a di- and/or tri-functional alcohol.
5. A printing paste according to claim 4 , wherein the polyurethane used is the polyaddition product of a diisocyanate and a polyester polyol produced by reacting succinic acid or adipic acid with an excess of a di- and/or tri-functional alcohol.
6. A printing paste according to claim 4 , wherein the polyurethane used is the polyaddition product of a diisocyanate and a polyester polyol produced by reacting a difunctional acid with an excess of ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, polyethylene glycol or polypropylene glycol.
7. A printing paste according to claim 4 , wherein the polyurethane used is the polyaddition product of hexamethylene diisocyanate, toluene diisocyanate or isophorone diisocyanate and a polyester polyol produced by reacting a difunctional acid with an excess of a di- and/or tri-functional alcohol.
8. A printing paste according to claim 1 , wherein the organic fixing agent b) is a fatty acid ester.
9. A printing paste according to claim 1 , wherein the organic fixing agent b) is a low molecular weight polyester.
10. A printing paste according to claim 1 , wherein as further ingredient(s), one or more natural or synthetic thickeners, pigments, acids, bases and/or salts to adjust the pH to the desired value, anionic, nonionic or cationic surfactants, antifoaming agents, antifrosting agents, polyhydroxy compounds or reaction products of hydroxyl compounds and isocyanates are used.
11. A printing paste according to claim 1 , containing as further component (c) 1 to 15% by weight of ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, polyethylene glycol or polypropylene glycol.
12. A printing paste according to claim 1 , containing no polyvinyl chloride or alkyl phthalates or heavy metals.
13. Any fabric or garment printed with a printing paste according to claim 1 .
14. A method for printing textile material comprising the steps of applying at least one coat containing a printing paste according to claim 1 and optionally a pigment and curing the coat.
15. A method for printing textile material comprising the steps of applying at least one base coat containing a printing paste according to claim 1 and optionally a pigment, curing the base coat, applying at least one overprint coat containing a printing paste according to claim 1 and a pigment, curing the overprint coat and finishing the textile material.